I. ˈȯ(r)bəd. ə l, -bət ə l adjective
Etymology: orbit (I) + -al
1. : of or relating to an orbit
orbital revolution
2. : ocular
an orbital scale
II. noun
( -s )
1. : a solution of the Schrödinger wave equation describing a possible mode of motion of a single electron in an atom or molecule
2. : the state that is described by the orbital